If a curved unit is showing up without doors, it's usually one of two options:
Wrong Unit Selected:
1. Go into base units, select Convex / Concave Base Units (bow)
2. Often Manufacturer doors do not appear on Quarter Circle units.
3. Make sure you have selected a unit from the "Radius End" category, or Variable Radius Corner Base.
Manufacture Door:
The final reason it could be is if the manufacturer doesn't tell us they do a curved door in that range, then the door either won't show or it will show up in the wrong shape.
The way around this is to select a range from the standard door’s which matches the look of the door that you want, Most standard doors will show on curved units so it should give the look that you are after.